diff --git a/.github/workflows/qc_checks.yaml b/.github/workflows/qc_checks.yaml
index 0aabd064bc..b3ad9e24d2 100644
--- a/.github/workflows/qc_checks.yaml
+++ b/.github/workflows/qc_checks.yaml
@@ -124,6 +124,16 @@ jobs:
 
     env:
       wrapper_name: inventree-python
+      INVENTREE_DB_ENGINE: django.db.backends.sqlite3
+      INVENTREE_DB_NAME: ../inventree_unit_test_db.sqlite3
+      INVENTREE_MEDIA_ROOT: ../test_inventree_media
+      INVENTREE_STATIC_ROOT: ../test_inventree_static
+      INVENTREE_ADMIN_USER: testuser
+      INVENTREE_ADMIN_PASSWORD: testpassword
+      INVENTREE_ADMIN_EMAIL: test@test.com
+      INVENTREE_PYTHON_TEST_SERVER: http://localhost:12345
+      INVENTREE_PYTHON_TEST_USERNAME: testuser
+      INVENTREE_PYTHON_TEST_PASSWORD: testpassword
 
     steps:
       - name: Checkout Code
@@ -140,13 +150,14 @@ jobs:
           git clone --depth 1 https://github.com/inventree/${{ env.wrapper_name }} ./${{ env.wrapper_name }}
       - name: Start Server
         run: |
-          invoke import-records -f ./${{ env.wrapper_name }}/test/test_data.json
-          invoke server -a 127.0.0.1:8000 &
-          sleep ${{ env.server_start_sleep }}
+          invoke delete-data -f
+          invoke import-fixtures
+          invoke server -a 127.0.0.1:12345 &
       - name: Run Tests
         run: |
           cd ${{ env.wrapper_name }}
-          invoke test
+          invoke check-server
+          coverage run -m unittest discover -s test/
 
   coverage:
     name: Sqlite / coverage
diff --git a/InvenTree/InvenTree/api.py b/InvenTree/InvenTree/api.py
index a8b2903a90..9d901516d5 100644
--- a/InvenTree/InvenTree/api.py
+++ b/InvenTree/InvenTree/api.py
@@ -57,6 +57,44 @@ class NotFoundView(AjaxView):
         return JsonResponse(data, status=404)
 
 
+class APIDownloadMixin:
+    """
+    Mixin for enabling a LIST endpoint to be downloaded a file.
+
+    To download the data, add the ?export=<fmt> to the query string.
+
+    The implementing class must provided a download_queryset method,
+    e.g.
+
+    def download_queryset(self, queryset, export_format):
+        dataset = StockItemResource().export(queryset=queryset)
+
+        filedata = dataset.export(export_format)
+
+        filename = 'InvenTree_Stocktake_{date}.{fmt}'.format(
+            date=datetime.now().strftime("%d-%b-%Y"),
+            fmt=export_format
+        )
+
+        return DownloadFile(filedata, filename)
+    """
+
+    def get(self, request, *args, **kwargs):
+
+        export_format = request.query_params.get('export', None)
+
+        if export_format and export_format in ['csv', 'tsv', 'xls', 'xlsx']:
+            queryset = self.filter_queryset(self.get_queryset())
+            return self.download_queryset(queryset, export_format)
+
+        else:
+            # Default to the parent class implementation
+            return super().get(request, *args, **kwargs)
+
+    def download_queryset(self, queryset, export_format):
+        raise NotImplementedError("download_queryset method not implemented!")
+
+
 class AttachmentMixin:
     """
     Mixin for creating attachment objects,
diff --git a/InvenTree/InvenTree/api_version.py b/InvenTree/InvenTree/api_version.py
index e391a00bd1..d5699f8de8 100644
--- a/InvenTree/InvenTree/api_version.py
+++ b/InvenTree/InvenTree/api_version.py
@@ -4,11 +4,16 @@ InvenTree API version information
 
 
 # InvenTree API version
-INVENTREE_API_VERSION = 47
+INVENTREE_API_VERSION = 48
 
 """
 Increment this API version number whenever there is a significant change to the API that any clients need to know about
 
+v48 -> 2022-05-12 : https://github.com/inventree/InvenTree/pull/2977
+    - Adds "export to file" functionality for PurchaseOrder API endpoint
+    - Adds "export to file" functionality for SalesOrder API endpoint
+    - Adds "export to file" functionality for BuildOrder API endpoint
+
 v47 -> 2022-05-10 : https://github.com/inventree/InvenTree/pull/2964
     - Fixes barcode API error response when scanning a StockItem which does not exist
     - Fixes barcode API error response when scanning a StockLocation which does not exist
diff --git a/InvenTree/InvenTree/middleware.py b/InvenTree/InvenTree/middleware.py
index 91cfefc6d6..b6550379e2 100644
--- a/InvenTree/InvenTree/middleware.py
+++ b/InvenTree/InvenTree/middleware.py
@@ -1,9 +1,12 @@
-from django.shortcuts import HttpResponseRedirect
-from django.urls import reverse_lazy, Resolver404
-from django.shortcuts import redirect
-from django.urls import include, re_path
+# -*- coding: utf-8 -*-
+
 from django.conf import settings
 from django.contrib.auth.middleware import PersistentRemoteUserMiddleware
+from django.http import HttpResponse
+from django.shortcuts import HttpResponseRedirect
+from django.shortcuts import redirect
+from django.urls import reverse_lazy, Resolver404
+from django.urls import include, re_path
 
 import logging
 
@@ -82,11 +85,23 @@ class AuthRequiredMiddleware(object):
                     reverse_lazy('admin:logout'),
                 ]
 
-                if path not in urls and not path.startswith('/api/'):
+                # Do not redirect requests to any of these paths
+                paths_ignore = [
+                    '/api/',
+                    '/js/',
+                    '/media/',
+                    '/static/',
+                ]
+
+                if path not in urls and not any([path.startswith(p) for p in paths_ignore]):
                     # Save the 'next' parameter to pass through to the login view
 
                     return redirect('{}?next={}'.format(reverse_lazy('account_login'), request.path))
 
+                else:
+                    # Return a 401 (Unauthorized) response code for this request
+                    return HttpResponse('Unauthorized', status=401)
+
         response = self.get_response(request)
 
         return response
diff --git a/InvenTree/build/admin.py b/InvenTree/build/admin.py
index a612ad8460..43909d2197 100644
--- a/InvenTree/build/admin.py
+++ b/InvenTree/build/admin.py
@@ -2,9 +2,53 @@
 from __future__ import unicode_literals
 
 from django.contrib import admin
-from import_export.admin import ImportExportModelAdmin
 
-from .models import Build, BuildItem
+from import_export.admin import ImportExportModelAdmin
+from import_export.fields import Field
+from import_export.resources import ModelResource
+import import_export.widgets as widgets
+
+from build.models import Build, BuildItem
+
+import part.models
+
+
+class BuildResource(ModelResource):
+    """Class for managing import/export of Build data"""
+    # For some reason, we need to specify the fields individually for this ModelResource,
+    # but we don't for other ones.
+    # TODO: 2022-05-12 - Need to investigate why this is the case!
+
+    pk = Field(attribute='pk')
+
+    reference = Field(attribute='reference')
+
+    title = Field(attribute='title')
+
+    part = Field(attribute='part', widget=widgets.ForeignKeyWidget(part.models.Part))
+
+    part_name = Field(attribute='part__full_name', readonly=True)
+
+    overdue = Field(attribute='is_overdue', readonly=True, widget=widgets.BooleanWidget())
+
+    completed = Field(attribute='completed', readonly=True)
+
+    quantity = Field(attribute='quantity')
+
+    status = Field(attribute='status')
+
+    batch = Field(attribute='batch')
+
+    notes = Field(attribute='notes')
+
+    class Meta:
+        models = Build
+        skip_unchanged = True
+        report_skipped = False
+        clean_model_instances = True
+        exclude = [
+            'lft', 'rght', 'tree_id', 'level',
+        ]
 
 
 class BuildAdmin(ImportExportModelAdmin):
diff --git a/InvenTree/build/api.py b/InvenTree/build/api.py
index e32b404ae2..4453232823 100644
--- a/InvenTree/build/api.py
+++ b/InvenTree/build/api.py
@@ -12,13 +12,15 @@ from rest_framework import filters, generics
 from django_filters.rest_framework import DjangoFilterBackend
 from django_filters import rest_framework as rest_filters
 
-from InvenTree.api import AttachmentMixin
-from InvenTree.helpers import str2bool, isNull
+from InvenTree.api import AttachmentMixin, APIDownloadMixin
+from InvenTree.helpers import str2bool, isNull, DownloadFile
 from InvenTree.filters import InvenTreeOrderingFilter
 from InvenTree.status_codes import BuildStatus
 
-from .models import Build, BuildItem, BuildOrderAttachment
+import build.admin
 import build.serializers
+from build.models import Build, BuildItem, BuildOrderAttachment
+
 from users.models import Owner
 
 
@@ -71,7 +73,7 @@ class BuildFilter(rest_filters.FilterSet):
         return queryset
 
 
-class BuildList(generics.ListCreateAPIView):
+class BuildList(APIDownloadMixin, generics.ListCreateAPIView):
     """ API endpoint for accessing a list of Build objects.
 
     - GET: Return list of objects (with filters)
@@ -123,6 +125,14 @@ class BuildList(generics.ListCreateAPIView):
 
         return queryset
 
+    def download_queryset(self, queryset, export_format):
+        dataset = build.admin.BuildResource().export(queryset=queryset)
+
+        filedata = dataset.export(export_format)
+        filename = f"InvenTree_BuildOrders.{export_format}"
+
+        return DownloadFile(filedata, filename)
+
     def filter_queryset(self, queryset):
 
         queryset = super().filter_queryset(queryset)
diff --git a/InvenTree/common/models.py b/InvenTree/common/models.py
index 44895af091..8b50d05413 100644
--- a/InvenTree/common/models.py
+++ b/InvenTree/common/models.py
@@ -17,15 +17,16 @@ import base64
 from secrets import compare_digest
 from datetime import datetime, timedelta
 
+from django.apps import apps
 from django.db import models, transaction
+from django.db.utils import IntegrityError, OperationalError
+from django.conf import settings
 from django.contrib.auth.models import User, Group
 from django.contrib.contenttypes.fields import GenericForeignKey
 from django.contrib.contenttypes.models import ContentType
-from django.db.utils import IntegrityError, OperationalError
-from django.conf import settings
+from django.contrib.humanize.templatetags.humanize import naturaltime
 from django.urls import reverse
 from django.utils.timezone import now
-from django.contrib.humanize.templatetags.humanize import naturaltime
 
 from djmoney.settings import CURRENCY_CHOICES
 from djmoney.contrib.exchange.models import convert_money
@@ -136,6 +137,19 @@ class BaseInvenTreeSetting(models.Model):
 
         return settings
 
+    def get_kwargs(self):
+        """
+        Construct kwargs for doing class-based settings lookup,
+        depending on *which* class we are.
+
+        This is necessary to abtract the settings object
+        from the implementing class (e.g plugins)
+
+        Subclasses should override this function to ensure the kwargs are correctly set.
+        """
+
+        return {}
+
     @classmethod
     def get_setting_definition(cls, key, **kwargs):
         """
@@ -319,11 +333,11 @@ class BaseInvenTreeSetting(models.Model):
             value = setting.value
 
             # Cast to boolean if necessary
-            if setting.is_bool(**kwargs):
+            if setting.is_bool():
                 value = InvenTree.helpers.str2bool(value)
 
             # Cast to integer if necessary
-            if setting.is_int(**kwargs):
+            if setting.is_int():
                 try:
                     value = int(value)
                 except (ValueError, TypeError):
@@ -390,19 +404,19 @@ class BaseInvenTreeSetting(models.Model):
 
     @property
     def name(self):
-        return self.__class__.get_setting_name(self.key)
+        return self.__class__.get_setting_name(self.key, **self.get_kwargs())
 
     @property
     def default_value(self):
-        return self.__class__.get_setting_default(self.key)
+        return self.__class__.get_setting_default(self.key, **self.get_kwargs())
 
     @property
     def description(self):
-        return self.__class__.get_setting_description(self.key)
+        return self.__class__.get_setting_description(self.key, **self.get_kwargs())
 
     @property
     def units(self):
-        return self.__class__.get_setting_units(self.key)
+        return self.__class__.get_setting_units(self.key, **self.get_kwargs())
 
     def clean(self, **kwargs):
         """
@@ -512,12 +526,12 @@ class BaseInvenTreeSetting(models.Model):
         except self.DoesNotExist:
             pass
 
-    def choices(self, **kwargs):
+    def choices(self):
         """
         Return the available choices for this setting (or None if no choices are defined)
         """
 
-        return self.__class__.get_setting_choices(self.key, **kwargs)
+        return self.__class__.get_setting_choices(self.key, **self.get_kwargs())
 
     def valid_options(self):
         """
@@ -531,14 +545,14 @@ class BaseInvenTreeSetting(models.Model):
 
         return [opt[0] for opt in choices]
 
-    def is_choice(self, **kwargs):
+    def is_choice(self):
         """
         Check if this setting is a "choice" field
         """
 
-        return self.__class__.get_setting_choices(self.key, **kwargs) is not None
+        return self.__class__.get_setting_choices(self.key, **self.get_kwargs()) is not None
 
-    def as_choice(self, **kwargs):
+    def as_choice(self):
         """
         Render this setting as the "display" value of a choice field,
         e.g. if the choices are:
@@ -547,7 +561,7 @@ class BaseInvenTreeSetting(models.Model):
         then display 'A4 paper'
         """
 
-        choices = self.get_setting_choices(self.key, **kwargs)
+        choices = self.get_setting_choices(self.key, **self.get_kwargs())
 
         if not choices:
             return self.value
@@ -558,12 +572,80 @@ class BaseInvenTreeSetting(models.Model):
 
         return self.value
 
-    def is_bool(self, **kwargs):
+    def is_model(self):
+        """
+        Check if this setting references a model instance in the database
+        """
+
+        return self.model_name() is not None
+
+    def model_name(self):
+        """
+        Return the model name associated with this setting
+        """
+
+        setting = self.get_setting_definition(self.key, **self.get_kwargs())
+
+        return setting.get('model', None)
+
+    def model_class(self):
+        """
+        Return the model class associated with this setting, if (and only if):
+
+        - It has a defined 'model' parameter
+        - The 'model' parameter is of the form app.model
+        - The 'model' parameter has matches a known app model
+        """
+
+        model_name = self.model_name()
+
+        if not model_name:
+            return None
+
+        try:
+            (app, mdl) = model_name.strip().split('.')
+        except ValueError:
+            logger.error(f"Invalid 'model' parameter for setting {self.key} : '{model_name}'")
+            return None
+
+        app_models = apps.all_models.get(app, None)
+
+        if app_models is None:
+            logger.error(f"Error retrieving model class '{model_name}' for setting '{self.key}' - no app named '{app}'")
+            return None
+
+        model = app_models.get(mdl, None)
+
+        if model is None:
+            logger.error(f"Error retrieving model class '{model_name}' for setting '{self.key}' - no model named '{mdl}'")
+            return None
+
+        # Looks like we have found a model!
+        return model
+
+    def api_url(self):
+        """
+        Return the API url associated with the linked model,
+        if provided, and valid!
+        """
+
+        model_class = self.model_class()
+
+        if model_class:
+            # If a valid class has been found, see if it has registered an API URL
+            try:
+                return model_class.get_api_url()
+            except:
+                pass
+
+        return None
+
+    def is_bool(self):
         """
         Check if this setting is required to be a boolean value
         """
 
-        validator = self.__class__.get_setting_validator(self.key, **kwargs)
+        validator = self.__class__.get_setting_validator(self.key, **self.get_kwargs())
 
         return self.__class__.validator_is_bool(validator)
 
@@ -576,17 +658,20 @@ class BaseInvenTreeSetting(models.Model):
 
         return InvenTree.helpers.str2bool(self.value)
 
-    def setting_type(self, **kwargs):
+    def setting_type(self):
         """
         Return the field type identifier for this setting object
         """
 
-        if self.is_bool(**kwargs):
+        if self.is_bool():
             return 'boolean'
 
-        elif self.is_int(**kwargs):
+        elif self.is_int():
             return 'integer'
 
+        elif self.is_model():
+            return 'related field'
+
         else:
             return 'string'
 
@@ -603,12 +688,12 @@ class BaseInvenTreeSetting(models.Model):
 
         return False
 
-    def is_int(self, **kwargs):
+    def is_int(self,):
         """
         Check if the setting is required to be an integer value:
         """
 
-        validator = self.__class__.get_setting_validator(self.key, **kwargs)
+        validator = self.__class__.get_setting_validator(self.key, **self.get_kwargs())
 
         return self.__class__.validator_is_int(validator)
 
@@ -651,88 +736,7 @@ class BaseInvenTreeSetting(models.Model):
 
     @property
     def protected(self):
-        return self.__class__.is_protected(self.key)
-
-
-class GenericReferencedSettingClass:
-    """
-    This mixin can be used to add reference keys to static properties
-
-    Sample:
-    ```python
-    class SampleSetting(GenericReferencedSettingClass, common.models.BaseInvenTreeSetting):
-        class Meta:
-            unique_together = [
-                ('sample', 'key'),
-            ]
-
-        REFERENCE_NAME = 'sample'
-
-        @classmethod
-        def get_setting_definition(cls, key, **kwargs):
-            # mysampledict contains the dict with all settings for this SettingClass - this could also be a dynamic lookup
-
-            kwargs['settings'] = mysampledict
-            return super().get_setting_definition(key, **kwargs)
-
-        sample = models.charKey(  # the name for this field is the additonal key and must be set in the Meta class an REFERENCE_NAME
-            max_length=256,
-            verbose_name=_('sample')
-        )
-    ```
-    """
-
-    REFERENCE_NAME = None
-
-    def _get_reference(self):
-        """
-        Returns dict that can be used as an argument for kwargs calls.
-        Helps to make overriden calls generic for simple reuse.
-
-        Usage:
-        ```python
-        some_random_function(argument0, kwarg1=value1, **self._get_reference())
-        ```
-        """
-        return {
-            self.REFERENCE_NAME: getattr(self, self.REFERENCE_NAME)
-        }
-
-    """
-    We override the following class methods,
-    so that we can pass the modified key instance as an additional argument
-    """
-
-    def clean(self, **kwargs):
-
-        kwargs[self.REFERENCE_NAME] = getattr(self, self.REFERENCE_NAME)
-
-        super().clean(**kwargs)
-
-    def is_bool(self, **kwargs):
-
-        kwargs[self.REFERENCE_NAME] = getattr(self, self.REFERENCE_NAME)
-
-        return super().is_bool(**kwargs)
-
-    @property
-    def name(self):
-        return self.__class__.get_setting_name(self.key, **self._get_reference())
-
-    @property
-    def default_value(self):
-        return self.__class__.get_setting_default(self.key, **self._get_reference())
-
-    @property
-    def description(self):
-        return self.__class__.get_setting_description(self.key, **self._get_reference())
-
-    @property
-    def units(self):
-        return self.__class__.get_setting_units(self.key, **self._get_reference())
-
-    def choices(self):
-        return self.__class__.get_setting_choices(self.key, **self._get_reference())
+        return self.__class__.is_protected(self.key, **self.get_kwargs())
 
 
 def settings_group_options():
@@ -1558,6 +1562,16 @@ class InvenTreeUserSetting(BaseInvenTreeSetting):
 
         return self.__class__.get_setting(self.key, user=self.user)
 
+    def get_kwargs(self):
+        """
+        Explicit kwargs required to uniquely identify a particular setting object,
+        in addition to the 'key' parameter
+        """
+
+        return {
+            'user': self.user,
+        }
+
 
 class PriceBreak(models.Model):
     """
diff --git a/InvenTree/common/serializers.py b/InvenTree/common/serializers.py
index 9d637c3e39..8dd0f5bcee 100644
--- a/InvenTree/common/serializers.py
+++ b/InvenTree/common/serializers.py
@@ -28,6 +28,10 @@ class SettingsSerializer(InvenTreeModelSerializer):
 
     choices = serializers.SerializerMethodField()
 
+    model_name = serializers.CharField(read_only=True)
+
+    api_url = serializers.CharField(read_only=True)
+
     def get_choices(self, obj):
         """
         Returns the choices available for a given item
@@ -75,6 +79,8 @@ class GlobalSettingsSerializer(SettingsSerializer):
             'description',
             'type',
             'choices',
+            'model_name',
+            'api_url',
         ]
 
 
@@ -96,6 +102,8 @@ class UserSettingsSerializer(SettingsSerializer):
             'user',
             'type',
             'choices',
+            'model_name',
+            'api_url',
         ]
 
 
@@ -124,6 +132,8 @@ class GenericReferencedSettingSerializer(SettingsSerializer):
                 'description',
                 'type',
                 'choices',
+                'model_name',
+                'api_url',
             ]
 
         # set Meta class
diff --git a/InvenTree/order/admin.py b/InvenTree/order/admin.py
index 0de28d5668..a1e1b74256 100644
--- a/InvenTree/order/admin.py
+++ b/InvenTree/order/admin.py
@@ -5,8 +5,9 @@ from django.contrib import admin
 
 from import_export.admin import ImportExportModelAdmin
 
-from import_export.resources import ModelResource
 from import_export.fields import Field
+from import_export.resources import ModelResource
+import import_export.widgets as widgets
 
 from .models import PurchaseOrder, PurchaseOrderLineItem, PurchaseOrderExtraLine
 from .models import SalesOrder, SalesOrderLineItem, SalesOrderExtraLine
@@ -92,6 +93,23 @@ class SalesOrderAdmin(ImportExportModelAdmin):
     autocomplete_fields = ('customer',)
 
 
+class PurchaseOrderResource(ModelResource):
+    """
+    Class for managing import / export of PurchaseOrder data
+    """
+
+    # Add number of line items
+    line_items = Field(attribute='line_count', widget=widgets.IntegerWidget(), readonly=True)
+
+    # Is this order overdue?
+    overdue = Field(attribute='is_overdue', widget=widgets.BooleanWidget(), readonly=True)
+
+    class Meta:
+        model = PurchaseOrder
+        skip_unchanged = True
+        clean_model_instances = True
+
+
 class PurchaseOrderLineItemResource(ModelResource):
     """ Class for managing import / export of PurchaseOrderLineItem data """
 
@@ -117,6 +135,23 @@ class PurchaseOrderExtraLineResource(ModelResource):
         model = PurchaseOrderExtraLine
 
 
+class SalesOrderResource(ModelResource):
+    """
+    Class for managing import / export of SalesOrder data
+    """
+
+    # Add number of line items
+    line_items = Field(attribute='line_count', widget=widgets.IntegerWidget(), readonly=True)
+
+    # Is this order overdue?
+    overdue = Field(attribute='is_overdue', widget=widgets.BooleanWidget(), readonly=True)
+
+    class Meta:
+        model = SalesOrder
+        skip_unchanged = True
+        clean_model_instances = True
+
+
 class SalesOrderLineItemResource(ModelResource):
     """
     Class for managing import / export of SalesOrderLineItem data
diff --git a/InvenTree/order/api.py b/InvenTree/order/api.py
index 2dab7684de..7c8a93125f 100644
--- a/InvenTree/order/api.py
+++ b/InvenTree/order/api.py
@@ -17,10 +17,11 @@ from company.models import SupplierPart
 
 from InvenTree.filters import InvenTreeOrderingFilter
 from InvenTree.helpers import str2bool, DownloadFile
-from InvenTree.api import AttachmentMixin
+from InvenTree.api import AttachmentMixin, APIDownloadMixin
 from InvenTree.status_codes import PurchaseOrderStatus, SalesOrderStatus
 
-from order.admin import PurchaseOrderLineItemResource
+from order.admin import PurchaseOrderResource, PurchaseOrderLineItemResource
+from order.admin import SalesOrderResource
 import order.models as models
 import order.serializers as serializers
 from part.models import Part
@@ -110,7 +111,7 @@ class PurchaseOrderFilter(rest_filters.FilterSet):
         ]
 
 
-class PurchaseOrderList(generics.ListCreateAPIView):
+class PurchaseOrderList(APIDownloadMixin, generics.ListCreateAPIView):
     """ API endpoint for accessing a list of PurchaseOrder objects
 
     - GET: Return list of PurchaseOrder objects (with filters)
@@ -160,6 +161,15 @@ class PurchaseOrderList(generics.ListCreateAPIView):
 
         return queryset
 
+    def download_queryset(self, queryset, export_format):
+        dataset = PurchaseOrderResource().export(queryset=queryset)
+
+        filedata = dataset.export(export_format)
+
+        filename = f"InvenTree_PurchaseOrders.{export_format}"
+
+        return DownloadFile(filedata, filename)
+
     def filter_queryset(self, queryset):
 
         # Perform basic filtering
@@ -407,7 +417,7 @@ class PurchaseOrderLineItemFilter(rest_filters.FilterSet):
         return queryset
 
 
-class PurchaseOrderLineItemList(generics.ListCreateAPIView):
+class PurchaseOrderLineItemList(APIDownloadMixin, generics.ListCreateAPIView):
     """ API endpoint for accessing a list of PurchaseOrderLineItem objects
 
     - GET: Return a list of PurchaseOrder Line Item objects
@@ -460,25 +470,19 @@ class PurchaseOrderLineItemList(generics.ListCreateAPIView):
 
         return queryset
 
+    def download_queryset(self, queryset, export_format):
+        dataset = PurchaseOrderLineItemResource().export(queryset=queryset)
+
+        filedata = dataset.export(export_format)
+
+        filename = f"InvenTree_PurchaseOrderItems.{export_format}"
+
+        return DownloadFile(filedata, filename)
+
     def list(self, request, *args, **kwargs):
 
         queryset = self.filter_queryset(self.get_queryset())
 
-        # Check if we wish to export the queried data to a file
-        export_format = request.query_params.get('export', None)
-
-        if export_format:
-            export_format = str(export_format).strip().lower()
-
-            if export_format in ['csv', 'tsv', 'xls', 'xlsx']:
-                dataset = PurchaseOrderLineItemResource().export(queryset=queryset)
-
-                filedata = dataset.export(export_format)
-
-                filename = f"InvenTree_PurchaseOrderData.{export_format}"
-
-                return DownloadFile(filedata, filename)
-
         page = self.paginate_queryset(queryset)
 
         if page is not None:
@@ -580,7 +584,7 @@ class SalesOrderAttachmentDetail(generics.RetrieveUpdateDestroyAPIView, Attachme
     serializer_class = serializers.SalesOrderAttachmentSerializer
 
 
-class SalesOrderList(generics.ListCreateAPIView):
+class SalesOrderList(APIDownloadMixin, generics.ListCreateAPIView):
     """
     API endpoint for accessing a list of SalesOrder objects.
 
@@ -630,6 +634,15 @@ class SalesOrderList(generics.ListCreateAPIView):
 
         return queryset
 
+    def download_queryset(self, queryset, export_format):
+        dataset = SalesOrderResource().export(queryset=queryset)
+
+        filedata = dataset.export(export_format)
+
+        filename = f"InvenTree_SalesOrders.{export_format}"
+
+        return DownloadFile(filedata, filename)
+
     def filter_queryset(self, queryset):
         """
         Perform custom filtering operations on the SalesOrder queryset.
diff --git a/InvenTree/part/admin.py b/InvenTree/part/admin.py
index fd0a16adc2..30dad8e995 100644
--- a/InvenTree/part/admin.py
+++ b/InvenTree/part/admin.py
@@ -4,8 +4,8 @@ from __future__ import unicode_literals
 from django.contrib import admin
 
 from import_export.admin import ImportExportModelAdmin
-from import_export.resources import ModelResource
 from import_export.fields import Field
+from import_export.resources import ModelResource
 import import_export.widgets as widgets
 
 from company.models import SupplierPart
diff --git a/InvenTree/part/api.py b/InvenTree/part/api.py
index ca9accf9e2..622ca38669 100644
--- a/InvenTree/part/api.py
+++ b/InvenTree/part/api.py
@@ -49,7 +49,7 @@ from . import serializers as part_serializers
 
 from InvenTree.helpers import str2bool, isNull, increment
 from InvenTree.helpers import DownloadFile
-from InvenTree.api import AttachmentMixin
+from InvenTree.api import AttachmentMixin, APIDownloadMixin
 
 from InvenTree.status_codes import BuildStatus, PurchaseOrderStatus, SalesOrderStatus
 
@@ -847,7 +847,7 @@ class PartFilter(rest_filters.FilterSet):
     virtual = rest_filters.BooleanFilter()
 
 
-class PartList(generics.ListCreateAPIView):
+class PartList(APIDownloadMixin, generics.ListCreateAPIView):
     """
     API endpoint for accessing a list of Part objects
 
@@ -897,6 +897,14 @@ class PartList(generics.ListCreateAPIView):
 
         return self.serializer_class(*args, **kwargs)
 
+    def download_queryset(self, queryset, export_format):
+        dataset = PartResource().export(queryset=queryset)
+
+        filedata = dataset.export(export_format)
+        filename = f"InvenTree_Parts.{export_format}"
+
+        return DownloadFile(filedata, filename)
+
     def list(self, request, *args, **kwargs):
         """
         Overide the 'list' method, as the PartCategory objects are
@@ -908,22 +916,6 @@ class PartList(generics.ListCreateAPIView):
 
         queryset = self.filter_queryset(self.get_queryset())
 
-        # Check if we wish to export the queried data to a file.
-        # If so, skip pagination!
-        export_format = request.query_params.get('export', None)
-
-        if export_format:
-            export_format = str(export_format).strip().lower()
-
-            if export_format in ['csv', 'tsv', 'xls', 'xlsx']:
-                dataset = PartResource().export(queryset=queryset)
-
-                filedata = dataset.export(export_format)
-
-                filename = f"InvenTree_Parts.{export_format}"
-
-                return DownloadFile(filedata, filename)
-
         page = self.paginate_queryset(queryset)
 
         if page is not None:
diff --git a/InvenTree/part/models.py b/InvenTree/part/models.py
index 492da8f5de..96ffa581f4 100644
--- a/InvenTree/part/models.py
+++ b/InvenTree/part/models.py
@@ -2233,7 +2233,7 @@ class Part(MPTTModel):
         for child in children:
             parts.append(child)
 
-        # Immediate parent
+        # Immediate parent, and siblings
         if self.variant_of:
             parts.append(self.variant_of)
 
diff --git a/InvenTree/plugin/models.py b/InvenTree/plugin/models.py
index 50e07df0d6..3d2d143eea 100644
--- a/InvenTree/plugin/models.py
+++ b/InvenTree/plugin/models.py
@@ -106,7 +106,7 @@ class PluginConfig(models.Model):
         return ret
 
 
-class PluginSetting(common.models.GenericReferencedSettingClass, common.models.BaseInvenTreeSetting):
+class PluginSetting(common.models.BaseInvenTreeSetting):
     """
     This model represents settings for individual plugins
     """
@@ -116,7 +116,13 @@ class PluginSetting(common.models.GenericReferencedSettingClass, common.models.B
             ('plugin', 'key'),
         ]
 
-    REFERENCE_NAME = 'plugin'
+    plugin = models.ForeignKey(
+        PluginConfig,
+        related_name='settings',
+        null=False,
+        verbose_name=_('Plugin'),
+        on_delete=models.CASCADE,
+    )
 
     @classmethod
     def get_setting_definition(cls, key, **kwargs):
@@ -146,16 +152,18 @@ class PluginSetting(common.models.GenericReferencedSettingClass, common.models.B
 
         return super().get_setting_definition(key, **kwargs)
 
-    plugin = models.ForeignKey(
-        PluginConfig,
-        related_name='settings',
-        null=False,
-        verbose_name=_('Plugin'),
-        on_delete=models.CASCADE,
-    )
+    def get_kwargs(self):
+        """
+        Explicit kwargs required to uniquely identify a particular setting object,
+        in addition to the 'key' parameter
+        """
+
+        return {
+            'plugin': self.plugin,
+        }
 
 
-class NotificationUserSetting(common.models.GenericReferencedSettingClass, common.models.BaseInvenTreeSetting):
+class NotificationUserSetting(common.models.BaseInvenTreeSetting):
     """
     This model represents notification settings for a user
     """
@@ -165,8 +173,6 @@ class NotificationUserSetting(common.models.GenericReferencedSettingClass, commo
             ('method', 'user', 'key'),
         ]
 
-    REFERENCE_NAME = 'method'
-
     @classmethod
     def get_setting_definition(cls, key, **kwargs):
         from common.notifications import storage
@@ -175,6 +181,17 @@ class NotificationUserSetting(common.models.GenericReferencedSettingClass, commo
 
         return super().get_setting_definition(key, **kwargs)
 
+    def get_kwargs(self):
+        """
+        Explicit kwargs required to uniquely identify a particular setting object,
+        in addition to the 'key' parameter
+        """
+
+        return {
+            'method': self.method,
+            'user': self.user,
+        }
+
     method = models.CharField(
         max_length=255,
         verbose_name=_('Method'),
diff --git a/InvenTree/plugin/samples/integration/sample.py b/InvenTree/plugin/samples/integration/sample.py
index 38ed259522..e2f10fcabe 100644
--- a/InvenTree/plugin/samples/integration/sample.py
+++ b/InvenTree/plugin/samples/integration/sample.py
@@ -65,6 +65,16 @@ class SampleIntegrationPlugin(AppMixin, SettingsMixin, UrlsMixin, NavigationMixi
             ],
             'default': 'A',
         },
+        'SELECT_COMPANY': {
+            'name': 'Company',
+            'description': 'Select a company object from the database',
+            'model': 'company.company',
+        },
+        'SELECT_PART': {
+            'name': 'Part',
+            'description': 'Select a part object from the database',
+            'model': 'part.part',
+        },
     }
 
     NAVIGATION = [
diff --git a/InvenTree/stock/api.py b/InvenTree/stock/api.py
index a42b6a2869..96a893e914 100644
--- a/InvenTree/stock/api.py
+++ b/InvenTree/stock/api.py
@@ -33,7 +33,7 @@ from company.serializers import CompanySerializer, SupplierPartSerializer
 
 from InvenTree.helpers import str2bool, isNull, extract_serial_numbers
 from InvenTree.helpers import DownloadFile
-from InvenTree.api import AttachmentMixin
+from InvenTree.api import AttachmentMixin, APIDownloadMixin
 from InvenTree.filters import InvenTreeOrderingFilter
 
 from order.models import PurchaseOrder
@@ -505,7 +505,7 @@ class StockFilter(rest_filters.FilterSet):
     updated_after = rest_filters.DateFilter(label='Updated after', field_name='updated', lookup_expr='gte')
 
 
-class StockList(generics.ListCreateAPIView):
+class StockList(APIDownloadMixin, generics.ListCreateAPIView):
     """ API endpoint for list view of Stock objects
 
     - GET: Return a list of all StockItem objects (with optional query filters)
@@ -646,6 +646,22 @@ class StockList(generics.ListCreateAPIView):
 
             return Response(response_data, status=status.HTTP_201_CREATED, headers=self.get_success_headers(serializer.data))
 
+    def download_queryset(self, queryset, export_format):
+        """
+        Download this queryset as a file.
+        Uses the APIDownloadMixin mixin class
+        """
+        dataset = StockItemResource().export(queryset=queryset)
+
+        filedata = dataset.export(export_format)
+
+        filename = 'InvenTree_StockItems_{date}.{fmt}'.format(
+            date=datetime.now().strftime("%d-%b-%Y"),
+            fmt=export_format
+        )
+
+        return DownloadFile(filedata, filename)
+
     def list(self, request, *args, **kwargs):
         """
         Override the 'list' method, as the StockLocation objects
@@ -658,25 +674,6 @@ class StockList(generics.ListCreateAPIView):
 
         params = request.query_params
 
-        # Check if we wish to export the queried data to a file.
-        # If so, skip pagination!
-        export_format = params.get('export', None)
-
-        if export_format:
-            export_format = str(export_format).strip().lower()
-
-            if export_format in ['csv', 'tsv', 'xls', 'xlsx']:
-                dataset = StockItemResource().export(queryset=queryset)
-
-                filedata = dataset.export(export_format)
-
-                filename = 'InvenTree_Stocktake_{date}.{fmt}'.format(
-                    date=datetime.now().strftime("%d-%b-%Y"),
-                    fmt=export_format
-                )
-
-                return DownloadFile(filedata, filename)
-
         page = self.paginate_queryset(queryset)
 
         if page is not None:
diff --git a/InvenTree/stock/models.py b/InvenTree/stock/models.py
index 53e1321e1a..a46d43b007 100644
--- a/InvenTree/stock/models.py
+++ b/InvenTree/stock/models.py
@@ -556,7 +556,14 @@ class StockItem(MPTTModel):
 
         # If the item points to a build, check that the Part references match
         if self.build:
-            if not self.part == self.build.part:
+
+            if self.part == self.build.part:
+                # Part references match exactly
+                pass
+            elif self.part in self.build.part.get_conversion_options():
+                # Part reference is one of the valid conversion options for the build output
+                pass
+            else:
                 raise ValidationError({
                     'build': _("Build reference does not point to the same part object")
                 })
diff --git a/InvenTree/templates/js/dynamic/settings.js b/InvenTree/templates/js/dynamic/settings.js
index 21eb9df5e2..5b52c2a015 100644
--- a/InvenTree/templates/js/dynamic/settings.js
+++ b/InvenTree/templates/js/dynamic/settings.js
@@ -71,9 +71,24 @@ function editSetting(key, options={}) {
                     help_text: response.description,
                     type: response.type,
                     choices: response.choices,
+                    value: response.value,
                 }
             };
 
+            // Foreign key lookup available!
+            if (response.type == 'related field') {
+                
+                if (response.model_name && response.api_url) {
+                    fields.value.type = 'related field';
+                    fields.value.model = response.model_name.split('.').at(-1);
+                    fields.value.api_url = response.api_url;
+                } else {
+                    // Unknown / unsupported model type, default to 'text' field
+                    fields.value.type = 'text';
+                    console.warn(`Unsupported model type: '${response.model_name}' for setting '${response.key}'`);
+                }
+            }
+
             constructChangeForm(fields, {
                 url: url,
                 method: 'PATCH',
diff --git a/InvenTree/templates/js/translated/build.js b/InvenTree/templates/js/translated/build.js
index 94c2780a28..814f2a3247 100644
--- a/InvenTree/templates/js/translated/build.js
+++ b/InvenTree/templates/js/translated/build.js
@@ -2355,7 +2355,7 @@ function loadBuildTable(table, options) {
 
     var filterTarget = options.filterTarget || null;
 
-    setupFilterList('build', table, filterTarget);
+    setupFilterList('build', table, filterTarget, {download: true});
 
     $(table).inventreeTable({
         method: 'get',
diff --git a/InvenTree/templates/js/translated/order.js b/InvenTree/templates/js/translated/order.js
index 538f37a710..372dc70a9a 100644
--- a/InvenTree/templates/js/translated/order.js
+++ b/InvenTree/templates/js/translated/order.js
@@ -1394,7 +1394,9 @@ function loadPurchaseOrderTable(table, options) {
         filters[key] = options.params[key];
     }
 
-    setupFilterList('purchaseorder', $(table));
+    var target = '#filter-list-purchaseorder';
+
+    setupFilterList('purchaseorder', $(table), target, {download: true});
 
     $(table).inventreeTable({
         url: '{% url "api-po-list" %}',
@@ -2091,7 +2093,9 @@ function loadSalesOrderTable(table, options) {
 
     options.url = options.url || '{% url "api-so-list" %}';
 
-    setupFilterList('salesorder', $(table));
+    var target = '#filter-list-salesorder';
+
+    setupFilterList('salesorder', $(table), target, {download: true});
 
     $(table).inventreeTable({
         url: options.url,